import {getRouters} from '@/api/menu'

const permission = {
  state: {
    routes: [],
    addRoutes: []
  },
  mutations: {
    SET_ROUTES: (state, routes) => {
      state.addRoutes = routes
      // TODO: 将动静态新增的路由和公共路由连接起来
      state.routes = routes
    }
  },
  actions: {
    // 生成路由
    GenerateRoutes ({ commit }) {
      return new Promise(resolve => {
        // 向后端请求路由数据
        getRouters().then(res => {
          const accessedRoutes = filterAsyncRouter(res.data)
          accessedRoutes.push({ path: '*', redirect: '/404', hidden: true })
          commit('SET_ROUTES', accessedRoutes)
          resolve(accessedRoutes)
        })
      })
    }
  }
}

// 遍历后台传来的路由字符串，转换为组件对象
function filterAsyncRouter (asyncRouterMap) {
  return asyncRouterMap.filter(route => {
    if (route.component) {
      // TODO: 研究Layout的作用
      // Layout组件特殊处理
      // if (route.component === 'Layout') {
      //   route.component = Layout
      // } else {
      //   route.component = loadView(route.component)
      // }
      route.component = loadView(route.component)
    }
    if (route.children != null && route.children && route.children.length) {
      route.children = filterAsyncRouter(route.children)
    }
    return true
  })
}

// 路由懒加载
export const loadView = (view) => import('@/views/' + view)

export default permission
